Skip to main content
Updates to LVK & CHIME Notices, Schema v7.2.3! See news and announcements

GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. See the documentation for help with subscribing to or submitting Circulars.

Search for Circulars by submitter, subject, or body text (e.g. 'Fermi GRB').
To navigate to a specific circular, enter the associated Circular ID (e.g. 'gcn123', 'Circular 123', or '123').
Advanced Search

To narrow the search results, use advanced search syntax. This allows for specifying which circular field to search (submitter, subject, and/or body). For additional information, refer to the advanced search documentation.

Advanced Search Examples (click to copy):

subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

32543 results found.

  1. GRB 071013: TNT optical data refined analysis
  2. GRB 071010B: Keck/DEIMOS emission-line redshift
  3. GRB 071013: TLS 2nd epoch - Kornienko candidate constant
  4. GRB071013: optical observations
  5. GRB 071010B: Optical observations of EST
  6. GRB 071010B: TLS 3rd Epoch - finally a break??
  7. GRB 071011: MITSuME Optical Observations
  8. GRB 070920A: deep optical observations at the NOT
  9. GRB 071010B: Photometry after 1.6 days
  10. GRB 071010B: Keck/LRIS Photometry
  11. GRB 071010B: TLS 2nd Epoch, refined analysis
  12. GRB 071013: TLS Upper Limit
  13. Correction to GCN circular no. # 6915 for GRB 071010B
  14. VLA detection of radio afterglow of GRB 071010B
  15. VLA non-detection of GRB 071011
  16. GRB 071013: optical observations at NOT
  17. GRB 071013, Swift-BAT refined analysis
  18. GRB071013: optical limit
  19. GRB 20071013: Xinglong TNT optical Upper Limit
  20. GRB 071011: Optical Limit after 13.95hrs
  21. GRB 071011: Xinglong TNT Optical afterglow observations
  22. GRB 071010B correction to GCN 6892 optical observations
  23. GRB 071011: Swift-XRT refined analysis
  24. VLA non-detection of GRB 071010A
  25. GRB 071011: NAYUTA Optical Observation, correction to GCN6886
  26. GRB 071011, Optical afterglow
  27. GRB 071011: Confirmation of P60 optical afterglow
  28. GRB 071010B: Optical Detection
  29. GRB 071011: Kanazawa Optical limits
  30. GRB 071011: P60 Optical Afterglow Candidate
  31. GRB 071011: MARGE Optical Limits
  32. GRB 071010B: Super-LOTIS upper limit
  33. GRB 071010B optical photometry
  34. GRB 071011: XRT afterglow detection
  35. GRB 071010B: Keck/LRIS Spectroscopy
  36. GRB 071011, Swift-BAT refined analysis
  37. GRB 071010B: Gemini Spectroscopic Observations
  38. GRB 071011: Early Super-LOTIS Observations
  39. GRB 071011: NAYUTA Optical Observation
  40. GRB 071010A: Continued Keck Imaging
  41. GRB 071010B: Bright OT confirmed with TLS
  42. Optical Observation: GRB 071010
  43. Optical observations: GRB 071010A
  44. Konus-Wind observation of GRB 071010B
  45. GRB071010B: Swift/XRT detection
  46. GRB 071010B, Swift-BAT refined analysis
  47. GRB 071010A: bright NIR afterglow
  48. GRB 071006, Swift-BAT refined analysis
  49. GRB071008: optical observations
  50. GRB 071010B possible optical transient
  51. GRB 071010A: Keck/LRIS Photometry
  52. GRB 071010: Swift-XRT observation
  53. GRB 071008, Swift-BAT refined analysis
  54. GRB 071010, Swift-BAT refined analysis
  55. Konus-Wind observation of GRB 071006
  56. GRB071008: Swift-XRT observation
  57. GRB 071010 REM NIR observations
  58. GRB 071010: Keck/LRIS Spectroscopy
  59. GRB 071010: Rapid PROMPT Detections
  60. GRB 071010: Keck Observations of the Afterglow
  61. GRB071008: IAC80 observation
  62. GRB 071003: XRT refined analysis
  63. GRB070920A: MAGIC telescope GeV observation
  64. Radio detection of GRB 071003 with the VLA
  65. GRB 070810B: further XRT analysis
  66. GRB 071003: VLT spectroscopy
  67. GRB 071003: Keck spectroscopy
  68. Konus-Wind observation of GRB 071003
  69. GRB071003: Faulkes Telescope North observations
  70. GRB 071003: Possible rebrightening
  71. GRB 071003 : Lulin R-band observations
  72. GRB 071003: Swift XRT position
  73. GRB 071003: OA power-law decay indices from KAIT
  74. GRB 071003: Keck HIRES spectroscopy
  75. GRB 071003, Swift-BAT refined analysis
  76. GRB 071003: MARGE Observations
  77. GRB 071003 Optical observations
  78. GRB 071003: P60 Confirmation of Optical Afterglow
  79. GRB 071003: KAIT optical afterglow observations
  80. GRB 070714B: host galaxy spectroscopic redshift
  81. GRB 071001: Swift-XRT Team refined analysis
  82. GRB 071001, Swift-BAT refined analysis
  83. Faulkes Telescope South observations of GRB 071001
  84. VLA observation of GRB 070923
  85. Disregard the Swift-XRT Notices today
  86. GRB 070911, SMARTS optical/IR afterglow observations
  87. GRB070925: Swift-XRT Afterglow confirmation
  88. GRB 070925: Gemini South Imaging
  89. GRB070925: Swift-XRT Position
  90. Update on Swift Status
  91. GRB 070920B: ROTSE-III Early Optical Limits
  92. Recent SGR1806-20 Activity
  93. GRB 070923, Swift-BAT refined analysis
  94. GRB 070920B: XRT observations
  95. GRB 070923: Galaxies within BAT localization
  96. GRB 070917: Suzaku/WAM observation of the prompt emission
  97. INTEGRAL ToO observations of SGR1806-20
  98. GRB 070920b, SMARTS optical observation
  99. GRB 070917: Confirmation of the X-ray afterglow
  100. GRB 070920b: LCO optical observations

Advanced

Download all Circulars as a .tar.gz archive (updated once a day):
Questions or comments?
Contact GCN directly.
Have you found a bug in GCN?
Open an issue.
Want to contribute code to GCN?
Get involved on GitHub.

gcn.nasa.gov

A service of the Astrophysics Science Division at NASA Goddard Space Flight Center

Looking for U.S. government information and services? Visit USA.gov